Comprehensive Utilization Of Residual Oil Based On Unit Union

According to reports,after 2020,heavy crude oil reserves account for about 50% of the world's crude oil reserves,and the proportion of residual oil processing in global crude oil processing is getting higher and higher.Therefore,it is a refinery that can efficiently convert and use residual oil.The key to improving competitiveness.At present,there are mainly two kinds of treatment routes for residue oil,such as hydrogenation and decarburization,corresponding to delayed coking unit and residue hydrogenation unit.The utilization rates of the two devices for the residue treatment are different.Therefore,how to formulate a reasonable production route and combine the subsequent processes is particularly important.At present,there are many researches on the optimization of single devices,and there are few studies on the optimization of the whole industry chain of the joint route.Delayed coking is currently the most commonly used residue treatment device.Using vacuum residue as raw material,deep thermal cracking and polycondensation reaction occurs at high temperature,and it is converted into dry gas,liquefied gas,gasoline,diesel oil,wax oil and petroleum coke.Compared with the delayed coking unit,the residue hydrogenation is a more advanced residue treatment device.The vacuum residue is used as a raw material to generate a hydrocracking reaction in a hydrogen environment.Hydrogenation is the only way to crack the residue into a light product while avoiding the formation of coke,so the device has the advantages of high yield,good quality and low waste of light oil products.Since there is no open subsystem in the process,the environmental protection effect is good.However,compared with the delayed coking unit,the device has high investment,high energy consumption,complicated equipment,difficult operation,and poor adaptability of the catalyst to raw materials.Full process modeling for delayed coking units and residue hydrotreating units,including reaction models and separation models.Combined with the actual solution difficulty and industrial precision requirements,the reaction modeling of delayed coking is based on the lumped reaction model.The reaction modeling of residue hydrogenation is based on the multi-collective narrow fraction model,and the reaction model can accurately predict the reaction yield.Based on ASPEN Plus,the separation section is strictly modeled,which can accurately calculate the energy consumption of the utility in the separation section,and provide data support for the subsequent route economic benefit accounting and product distribution.At present,the price of low-sulfur petroleum coke is good,and it is difficult for the delayed coking unit to independently produce high-quality low-sulfur petroleum coke.The combination of the residue hydrotreating unit and the delayed coking unit is required.In order to obtain the optimal processing route,a super device combined with the downstream device is established.The structure,at the same time,the economic benefit of the traditional decarburization route mixing hydrocracking oil and the traditional hydrogenation route coking wax oil is evaluated and analyzed,and the hydrogenation route coking wax oil blending ratio is obtained.At 0.12,the profit was the largest,and the delayed coking route hydrocracking oil blending ratio of 0.77 had the largest economic benefit.Subsequently,based on the rigorous model of residue hydrogenation and delayed coking unit,the superstructure of the combined treatment of residual oil was established,and the yield correction coefficient of the residue hydrotreating and delayed coking unit in the production plan and the processing cost of the unit were checked.Finally,the optimization is to get the best processing route.